Island



(No Model.) 3 SheetsSl1eet 1. J. HOPE.

PANTOGRAPH ENGRAVING MACHINE. No. 462,874. Patented Nov. 10, 1891.

Fig: 1 6B 7 WZZ'NEEEIEI .Z'NVENZUH:

(No Model.) 3 Sheets-Sheet 2.

J. HOPE. PANTOGRAPH ENGRAVING MACHINE.

INS/ENTER Patented N0 (No Model.) 3 SheetsSheet 3. J HOPE PANTOGR'APHENGRAVING MACHINE.

Patented Nov. 10,1891.

jy'S/ZQZTUEI Nirnn STATES PATENT OFFICE.

JOHN HOPE, OF PROVIDENCE, Rl-IODE ISLAND.

PANTOGRAPH ENGRAVING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 462,874, dated November10, 1891. Application filed July 31, 1891- Serial No. 401,288. (Nomodel.)

To all whom it may concern.-

.Be it known that I, JOHN HOPE, ot' the city of Providence, in thecounty of Providence and State of Rhode Island, have invented a new anduseful Improvement in Pantograph Engraving-Machines; and I herebydeclare that the following is a full, clear, and exact descriptionthereof, reference being had to the accompanying drawings, forming partof this specification.

This invention has reference to improvements in the construction of theclass of pantograph engraving-machines used for tracing the drawing on ametal roll by a series of diamond points controlled by a stylus which ismade to traverse a pattern of largersize than the drawing traced on theroll. Machines of this class consist of a number of diamond-pointedgravers fixed upon a bar and so connected with a foot-treadle that theoperator can bring all the diamond-pointed gravers in contact-with themetal roll, so as to trace the pattern on the roll by cutting throughthe wax or varnish, which resists the action of acids and with which theroll is covered. The bar to which the diamondpointed gravers are securedhas a traverse parallel with the axis of the roll to be engraved and isconnected with the stylus-carriage. The roll is supported on milleddisks, to which a rotary motion is imparted by the carriage carrying thestylus, so that in tracing any figure or line not parallel with the axisof the roll a compound motion is pro-v duced, consisting in the traverseof the bar carrying the diamond-pointed gravers and the rotary motion ofthe roll. The patternsketch, which is usually made of asize larger thanthe size of the intended figure on the roll, is placed upon the flatsurface of a table in front of the operator. Over the sketch is a stylusmounted on a hinged arm secured to a carriage. Every movement of thestylus in tracing the pattern-sketch is transmitted to the bar carryingthe gravers and to the roll, so that as many duplicates of the patternare traced on the roll on a reduced scale as there are gravers. \Vhenone line of patterns has been so traced, the roll is turned and anotherline traced until the Whole roll is covered. In this class of pantographengraving-machines the transmitting mechanism must move with microscopicaccuracy and yet with such ease that all the motions of the roll and thecarriages can be produced by the moving of the stylus over the patternby a girl without causing laborious exertions.

One object of this invention is to reduce the frictional resistance ofthe moving parts and at the same time increase the accuracy.

Another object of this invention is to produce a pantograph engravingmachine in which two or more carriages each carrying a row ofdiamond-pointed gravers may be used, so that a number of lines ofpatterns may be engraved on the roll simultaneously; and another objectof this invention is to produce a machine in which a row or rows ofpatterns may be engraved on a roll and simultaneously therewith a row orrows of patterns may be engraved in the reversed direction, so thatcomplicated continuous patterns in which some of the figures, leaves, orpatterns are placed in reversed positions may be engraved from onepattern-sketch.

The invention consists in the peculiar and novel construction andarrangement of a pantograph engraving-machine, as will be more fully setforth hereinafter, and pointed out in the claims.

Figure 1 is a vertical cross-section of my improved pantograph engravingmachine. Fig. 2 is a front view of the same. Fig. 3 is a skeleton Viewof the wires surrounding the disks shown in Fig. 4. Fig. 4. is asectional view through the center of the disks 65. Fig. 5 is a sectionalview of the reciprocating carriage and the ways on which it issupported. Fig. 6 is an enlarged view showing the device for verticallyadjusting the carriages. Fig. 7 is a sectional view of the same. Fig. 8is a view of the pivotal bulb, showing the rail with the V-shaped groovein section.

Similar numbers and letters of reference indicate corresponding partsthroughout.

In the drawings, the number 10 indicates the end standards on which themachine is supported. I

11 indicates the table on which the patternsketch is placed. This tableis firmly supported on the brackets 12, which are seen red to the rail13. The stylus ii is placed on the outer end of the tracer-arm 15, whichis hinged to the carriage 16, supported by wheels on the ways 17, whichextend lengthwise of the machine and are secured near their ends to thecarriages 18, one near each end of the machine, the wheels of which rollon the ways 19, secured to the end standards 10. The carsurface of whichis to be engraved. It is shown in broken lines in Fig. 1. It is notshown in Fig; 2.

For the purpose of clearness in the description all reference tolongitudinal motion is to be understood as referring to motion parallelto the axis of the roll 20, and all reference to transverse motion amotion in'a direction at right angles to the axis, all curves or angularlines being produced by the compound longitudinal and transversemotions.

The transverse motion of the stylus is transformed into a partial rotarymotion of the roll. This part of the mechanism of my improved machinediffers but slightly from pantograph engraving-machines as heretoforeconstructed, the essential difference being the improved pivotal bulbconnection and consequent modification of the rail which takes the placeof the pivotal carriage heretofore used. This pivotal connection isclearly shown in Fig. 8. It consists of the spherical bulb21,'connectedby a contracted neck with the arm or lever to which it issecured. The bulb is accurately formed into about twothirds of a perfectsphere, which rests in the V-shaped groove 22. Thereare only two smallpoints 'of contact of the bulb or ball on the sides of the groove. Thebulb slides in the groove nearly without friction and secures the greatand essential advantage of abso lute accuracy, avoiding all thelooseness of parts and lost motion incident to the most perfectlyconstructed and adjusted pivotal carriage as heretofore used in place ofthe bulb.

The mechanism for transmitting the transverse -motion of the stylusconsists in the bracketed way23, secured to the carriage 18, preferablyon the right-hand side of the machine, as shown in Fig. 2. The way 23 isprovided with the V-shaped groove 22, the direction of the groove beingexactly parallel with the axis of the cylinder to be engraved. The arm24 is provided at its outer end with the bulb 21, which rests in theV-shaped groove of the way 23. The arm 24 is hinged at its opposite endto the lever 25, extending from the pivoted post 26, the upper arm ofwhich is provided with a groove, in which the post 27, provided at itsupper end with a spherical bulb, is secured, so as to be readily adjustable with reference to the pivotal center of the post 26. The bulb onthe upper end of the post 27 supports the bar 28, provided with alongitudinal V-shaped groove. The bar 28 is hinged to the rear frame 29,and to the same are connected the ways 30, extending transversely to themachine and supported on Wheels journaled in brackets projecting fromthe slide-stocks 31. These slide-stocks are substantial metal frames, inwhich the bearing-disk 33 and wheel 32 are journaled. The slide-stocksare firmly secured to the bedplate 9. They are adjustable laterally tothe length of the roll to be engraved. The roll rests on the disks 33and wheels 32 at each end. The disks 33 are idle-disks freely turning ontheir journals. The. wheels 32 have a milled raised edge on the innerside, as shown in Fig. 2, and a faced surface, to which the ends of thesprings 34 and 35 are secured. The other ends of the springs 34 aresecured to the blocks 36 on the front ends of the ways 30. The blocks 36move in T-sh'aped grooves and are provided with tension-screws, by whichthe springs can be adjusted. The ends of the springs 35 are secured toblocks on the rear part of the ways 30. These blocks are also providedwith tension-screws. By means of these springs the transverse motionofthe ways 30 is transmitted to and changed to the rotary motion of thewheels 32 and by the same to the rotary motion of the roll 20.

The longitudinal motion of the stylus is transmitted to the carriages orgraver-barsin exactly'the same manner. The carriage 16 is provided witha rail 37, extending transversely to the machine. This rail is providedwith a V-shaped groove, in which the bulb on the end of the hinged arm38 slides. The arm 38 is hinged to the arm 39, which moves with thepivoted post at the rear of the machine. The upper part of the post hasthe slide 40, in which the bulb-post 41 is secured, so that it may beadjusted at any required distance from the pivotal center. The arm 42 ishinged to the carriage or graverbar 43, and thus connects the graver-bar43 with the bulb on the post '41. Any lateral motion of the carriage 16is thus transmitted to the graver-b'ar 43. The arm 42 is madesufficiently rigid to prevent lost motion, the hinged end havingconsiderable width.

The gr'aver-bar 44 is shown in Fig. 1 with two sets of gravers supportedby and secured to one bar, while the graver-bars 43 and 45 each areshown as supporting one set of gravers. For ordinary work, in which allthe gravers move together, the arrangement shown is the most convenient.The graverbars 44 and 45 are formed into a frame by the end connections46 and reciprocate together. All the graver-bars are supported on thedouble rollers 47, formed of a roller provided with a tubular shaft anda roller provided with a solid shaft which fits closely by aclose-sliding fit into the tubular shaft, so that the disks forming therolls proper can adjust themselves to the grooves in which they roll, asis shown in Fig. 5.

The disks (shown enlarged in Fig. 4) are mounted on the shaft &8,supported in the ways 49. The rims of the disks are provided with ashallow groove in which the wires and 51 lie. The ends of the wire 50are secured to the graver-bar at and the ends of the wire 51 to the bar52, connected by the frame 53 with the graver-bar Both wires areprovided with tension-screws, by which they are drawn tightly onto therims of the disks 65. The thumb-screw 5% is used to clamp the diskstogether, so that the motion of the graver-bar 4:3 is transmitted to thegraver-bar at, so that when the graver-bar43 moves to the right thegraver bar 44 will be moving to the left or in the reverse position, andwhenfour graveubars are used two will move in the direction opposite tothe direction of the other two bars, or, more definitely to define theresult, two sets of gravers will engrave the reduced pattern on the rollin one position and the other two sets of gravers will engrave thereduced pattern in the reverse position.

The diamondpointed gravel-s are indicated by the letters a, l), c, andd. They are mounted in hinged arms overbalanced, so that in the normalcondition they are held off from but very close to the roll. All thearms of the gravers are operated simultaneously by the rock-bars 06,connected by means of levers and the rods 55 with the foot-treadle 56,through which the operative by aslight pressure of the footbrings allthe gravel-s into contact with the roll to be engraved.

As the diameters of the rolls to be engraved vary considerably, thegraver-bars 4t and 45 are made vertically adjustable. To perform thisadjustment with the accuracy required in pantograph engraving-machines,the device shown in Figs. 6 and 7 is used, consisting in the end frames57, firmly secured to and extending upward from the bed-plate 9. Theseend frames are provided with accurately-planed ways, in which thesliding frame 58 maybe reciprocated. The graverbars at and 45 aresecured to and supported by the frame 58. To the lower part on each endof the sliding frame 58 a flat sheet-metal strip 59 is secured. Thisstrip passes upward over the roller 60, supported and journaled in theend frames 57,and then passes down and around the drum 61, to which theother end of the strip 59 is secured. The drum 61 is secured to theshaft 62 near each. end of the machine. The worm-gear 63 is also securedto the shaft 62. A worm turned by the crank (it engages with theworm-gear to turn the shaft, so as to wind the metal strip 59 on thedrum 61 to raise the vertically-sliding frame 58, and with the same thegraver-bars, or lower the frame and bars by unwinding the sheet-metalstrip. By this arrangementa very accurate adjustment of the uppergraver-bars and the gravers is secured.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. In a pantograph engravingqnachine, thecombination, with the stylus, its carriage, and the levers fortransmitting the motion of the stylus to the roll to be engraved and tothe gravers, of two sets of graver-bars connected through anintermediate disk constructed to move the graver-bars simultaneously inopposite directions, as described.

2. In a pantograph engravirig-machine, the combination, with the stylus,its carriage, the levers for transmitting the motion of the sty lus, andthe gravers, of two graver-bars, one of which has capacityof verticaladjustment, and mechanism connecting the two graverbars constructed totrace the pattern followed by the stylus on the roll simultaneously inthe same and the reverse direction, as described.

The combination, in a pantograph engraving-machine, with the stylus, itscarriage, and the levers for transmitting the motion of the stylus tothe roll to be engraved and to the gravers, of two sets of graver-bars,the upper graver-bars having capacity of vertical adjustment,constructed to support four lines of gravers and engrave fourlines ofpatterns 011 the rolls simultaneously by the movement of the stylus overthe enlarged pattern, as described.

4:. The combination, with the levers transmitting the motion of thestylus to the gravers and to the rollto be engraved in a pantographengraving-machine, of the bulb 21 and the V-shaped groove 5. Thecombination, with the ways and the graver'bars of a pantographengraving-machine, of the roller 47, consisting in a disk provided witha tubular shaft and a disk having a shaft supported in the tubular shaftof the other disk, as described.

6. The combination, with the bed-plate 9 and end frames 57, of thesliding frames 58, the metal strip 59, the rollers 60, the drums 01, theshafts (J2, and mechanism for rotating the shaft, constructed to adjustthe graverbar of a pantograph engraving-machine, as described.

'7. The combination, with the graver-baraS and the graVer-bar 44, of thewires 50 and 51, the disks 65, and the connections between the wires andthe graver-bars, as described.

8. In a pantograph engraving-machine, the combination, with the stylus,its carriage, and the levers transmitting the motion to thelongitudinally-reciprocating gravers, of the roll 20, the disks 33, thewheels 32, the springs 34: and 35, the frame 29, the ways 30, and thelevers connecting the frame 29 with the styluscarriage, constructed totransmit the motion of the stylus to the gravers and the roll, asdescribed.

9. The combination, in a pantograph engraving-machine, with thebed-plate 9, of the slide-stocks 31, provided withjournals for thebearing disk and wheel, the disks 33, and the wheels 32, having raisedmilled edges to form the bearing for the roll to be engraved and IIOconnected with the transversely moving frame, as described.

10. A pantograph engraving-machine consisting of a stylus and mechanism,substantially as described, for transmitting the 1011- gitudinal motionsof the stylus to two sets of graver-bars, one set of graver-bars havingcapacity for lateral adjustment, levers for transmitting the transversemotion of the stylus to transversely-moving ways, disks forsupportingthe roll to be engraved, and flexible connections between thedisks and the transversely-moving frame, the wholeconstructed to engravethe pattern traversed by the stylus on the roll on a reduced scale bymoving two or more lines of gravers longitudinally and rotating theroll, as described.

JOHN HOPE.

\Vitnesses:

J. A. MILLER, J r., JOSEPH A. MILLER.

